Question

$- 9 - (x) = 6$
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Answer 1

$- 9 - (x) = 6 \\ - 9 - x = 6 \\ - 9 - 6 = x \\ - 15 = x$

Espero que te sirva, saludos uwu

Answer 2

-x=6+9
-x=15
X=-15
.......